    /*最小屏幕 */
    
    @media (min-width:320px) and (max-width:991px) {
        /* 导航部分 */
        nav {
            width: 100%;
            background-color: white;
            border-bottom: 5px solid #68b0ab;
        }
        nav ul li a {
            font-weight: bold;
            width: 55px;
            height: 25px;
            line-height: 25px;
            margin-left: 20px;
        }
        .fonts {
            z-index: 1;
            position: fixed;
            top: 0;
            right: 0;
            bottom: 0;
            left: 0;
            margin: auto;
            width: 200px;
            height: 200px;
            background-color: rgba(0, 0, 0, 0.3);
            -webkit-filter: blur(2px);
            -moz-filter: blur(2px);
            -ms-filter: blur(2px);
            -o-filter: blur(2px);
            filter: blur(1px);
            color: white;
            border-radius: 15px;
        }
        .fonts h1 {
            font-weight: bold;
            text-align: center;
            font-size: 15px;
        }
        .fonts strong {
            color: #35ac39;
        }
        .fonts h2 {
            text-align: center;
            font-size: 10px;
            font-weight: bold;
        }
    }